Input: 110/220VAC 60HzPrimary Connections 120 VAC:Connect the 2 black wires together and connect the 2 red wires together and apply power to each pair.Primary Connections 220 VAC:Connect the inner black & red wires together and apply power to the outer black & red wires

Input: 110/220VAC 60HzPrimary Connections 120 VAC:Connect the 2 black wires together and connect the 2 red wires together and apply power to each pair.Primary Connections 220 VAC:Connect the inner black & red wires together and apply power to the outer black & red wires